I use GFS for some bulk items - lentils, pinto beans, etc. I did a huge comparison spreadsheet between them, Sam's, Costco, Wal-Mart and Publix. Sam's does beat GFS on most items, but only by 5-10%, and you have to pay the $40 membership fee. Therefore, I am estimating a Sam's membership is worth it if you spend around $400 a year or more (This means you have paid for the membership cost in savings). I only spend $100 a year or less, so I stick with GFS.